My Philips HQ5812 shaver won't turn on or start at all, it has been charged and the green light still comes on when on charge. It has suddenly stopped working after 2 years use, for no real apparent reason. Any ideas how to fix it?

did the shaver still hold a charge well before it stopped working? Or had it gotten to where it would not hold a charge?did the shaver still hold a charge well before it stopped working? Or had it gotten to where it would not hold a charge?

6 Suggested Answers

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The batteries are soldered to the circuit board with solder tabs. These are not standard chargeable batteries that can be bought at the corner hardware store. The are Lithium Oxide based batteries with solder tabs. These should be replaced by an experienced tech. The replacement batteries must be to spec of the original ones. There is the current rating and voltage rating of the batteries to matched.

Because these chargeable batteries can put out a strong amount of current, if they are not installed properly, there can be safety issues.

Call Philips tech support to be advised about where you can take the shaver to have the batteries changed.

Problem:Model ES7037CMB - Over the past month the Panasonic shaver would turn on with 3-4 tries, but now will not turn on at all – the on-off switch must be bad after only 7 months of wet use.Before sending in I found this diagram:

Disassembly:Remove bottom Phillips screw & end cap, pop off each plastic side with fingernails (reinstall them from top 1st), remove 4 screws, remove 2 clips, take top off.Remove battery case and the on-off little, white plastic lever fell out.Slide off the white plastic/metal on-off slider & clean contacts with knife … my bottom contact was black & top was clean.

Assembly:Reinstall on-off slider (white plastic with metal contacts) by sliding back in grooves -- hardest part - place the on-off plastic lever on the battery back unit – I tried to put it on the case and could not get it to stay on.Slide the battery pack back in with the plug prongs in the holes in the end being careful not to drop the on-off lever.Test shaver.Stuff battery wires inside case – screw 4 screws and add 2 clips on, then final screw in the end after cap placed on.Easy once I knew how to put the on-off lever on the battery side – that was tricky.Total time was about 1 hour – next time it will be about 15 minutes.Works great! jgg 12-27-08.Think I will use it dry from now own since it had a lot of whiskers inside of it and maybe wash only the head as needed with baby shampoo.

Shaving head check indication
After two years of use the red shaving unit symbol
î will flash for 30 seconds during 7 shaves to
indicate that you should check the condition of the
shaving heads. This indication is based on an average
shaving time of 3 minutes per shave. When the
shaving head symbol flashes, all other symbols and
lights are out. When the shaver is switched off, the
shaving unit symbol disappears.
When the red shaving unit symbol starts flashing,
you should check the shaving heads for possible
damage. If the shaving heads are damaged in any way,
they must be replaced in order to obtain optimal
shaving results

The "Braun 5520" doesn't have the 2 screws under 2 small caps on bottom, as described by so many on these boards.The round plastic plug receptacle 'itself' is the release. (Twist-Release the outer ring.)Look on the base, where you plug the AC cord in.... Just inside the rim, you will see two small 'recesses', opposite each other, that allow a wedge tool (like a large screw driver) to turn the rim counter-clockwise (left) 45 degrees, releasing the base and housing.Once this is unlocked, slide the cover off and pop the black retainer cover off to reveal the "PC Board W/Batteries" module/assembly. (Batteries are NOT replaceable by themselves.)There is a tiny (and I mean "tiny"!) resistor that burns out in the circuit board and causes the majority of power malfunctions in these models.You can order a new PC Board (with batteries) for approx. $40.00. (+ S&H)One place is: "http://www.electricshaverstore.com/get_item_5505631_braun-pc-board-w-batteries.htm".(Fits Models: 5510, 5515, 5520, 6515, 6520, 6510, 6512 - Types: 5505, 5506, 5705, 5706)

Your batteries are starting to degrade, but the good news is they're still holding a charge for a week, so you really don't need to rush to replace them at this point.

The flickering of the charged indicator is normal, as the shaver is still plugged in and the batteries are fully charged. The flickering is due to the batteries chemicals breaking down, and as such, the charge cycle keeps "topping" them off while it's still plugged in.

When you finally aren't able to get a decent amount of cordless operation and run times from your shaver, then you'll want to get them replaced, whether you decide to do that yourself or have it done by a professional service center, is up to you.

Here's a reference for your future use. www.electricshaver.com carries replacement (factory OEM) batteries for most brands of shavers and they also will provide the repair/replacement service for you, should you decide you don't want to do it yourself. You can also give them a call at 1-888-476-1785 and request a price quote, etc.

Anyway, your shaver is working fine and all you need to do is make sure you're not letting the shaver stay plugged in and charging constantly for more than a day, since any "extra" chargind isn't doing anything except keeping the batteries at a constant state of charge. Heat is a byproduct of charging and discharging any battery and as such, you want to allow for a cool down period before recharging them.

I tend to use my shaver until it is almost completely discharged before recharging it. By doing this, you can get the longest working life out of your batteries before you'll have to replace them.

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It is impossible for me to say for sure without actually looking at it but the problem is, most likely, the battery. Changing it will probably fix the problem.
Take a look at the circuit boeard for corrosion or burnt spots. If you see neither of these, I would say that there is a 98% chance that only the battery needs changed